Contrary to popular belief. Apple’s iPhone TTY Adapter ($19) is not a 3.5mm headphone plug-to-iPod adapter — it’s an adapter that enables an iPhone to be connected to a TTY text telephone terminal, primarily used by people with hearing or speech issues. When connected to a TTY device through the small port, iPhone can relay typed messages to another TTY device or a relay service, where a human will read the messages to a recipient who can hear them. Note that the photo shows how 3.5mm headphone plugs are too big for the hole.

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Company and Price
Company: Apple
Website: www.Apple.com
Model: iPhone TTY Adapter
Price: $19
Compatible: iPhone